#include <stdio.h>
#include <stdlib.h>
#define PAGELEN 24
#define LINELEN 52

void do_more(FILE *);
int see_more(FILE *);

int main(int ac, char* av[]){
	FILE * fp;
	if (ac == 1){
		do_more(stdin);
	}else{
		while (--ac){
			if ((fp = fopen(* ++av, "r")) != NULL){
				do_more(fp);
				fclose(fp);
			}else{
				exit(1);
			}
		}
	}
	return 0;
}

void do_more(FILE * fp){
	char line[LINELEN];
	int num_of_lines = 0;
	int see_more(FILE *), reply;
	FILE *fp_tty;
	fp_tty = fopen("/dev/tty", "r");
	if (fp_tty == NULL){
		exit(1);
	}
	while (fgets(line, LINELEN, fp)){
		if (num_of_lines == PAGELEN){
			reply = see_more(fp_tty);
			if (reply == 0){
				break;
			}
			num_of_lines -= reply;
		}
		if (fputs(line, stdout) == EOF){
			exit(1);
		}
		num_of_lines++;
	}
}

int see_more(FILE *cmd){
    int c;
	printf("\033[7m more? \033[m");
	while ((c = getc(cmd)) != EOF){
		if (c == 'q'){
			return 0;
		}
		if (c == ' '){
			return PAGELEN;
		}
		if (c == '\n'){
			return 1;
		}
	}
}
